[syzbot] [ocfs2?] UBSAN: shift-out-of-bounds in ocfs2_fill_super

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d07b43284ab3 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1397f4fd980000
kernel config: https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b
dashboard link: https://syzkaller.appspot.com/bug?extid=f3fff775402751ebb471
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1306b191980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11905bd3980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-d07b4328.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/91ceec6e19d3/vmlinux-d07b4328.xz
kernel image: https://storage.googleapis.com/syzbot-assets/be11646b0c05/bzImage-d07b4328.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/0847e1dfc637/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f3fff7...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/ocfs2/super.c:2360:4
shift exponent 1548 is too large for 32-bit type 'int'
CPU: 0 UID: 0 PID: 5093 Comm: syz-executor251 Not tainted 6.11.0-rc3-syzkaller-00060-gd07b43284ab3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
ubsan_epilogue lib/ubsan.c:231 [inline]
__ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
ocfs2_verify_volume fs/ocfs2/super.c:2360 [inline]
ocfs2_sb_probe fs/ocfs2/super.c:792 [inline]
ocfs2_fill_super+0x106e/0x5880 fs/ocfs2/super.c:988
mount_bdev+0x20a/0x2d0 fs/super.c:1679
legacy_get_tree+0xee/0x190 fs/fs_context.c:662
vfs_get_tree+0x90/0x2a0 fs/super.c:1800
do_new_mount+0x2be/0xb40 fs/namespace.c:3472
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76bb986dea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe83d62948 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe83d62960 RCX: 00007f76bb986dea
RDX: 0000000020004480 RSI: 00000000200044c0 RDI: 00007ffe83d62960
RBP: 0000000000000004 R08: 00007ffe83d629a0 R09: 000000000000446c
R10: 0000000002800400 R11: 0000000000000282 R12: 0000000002800400
R13: 00007ffe83d629a0 R14: 0000000000000003 R15: 0000000001000000
</TASK>
---[ end trace ]---


---
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[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+f3fff7...@syzkaller.appspotmail.com
Tested-by: syzbot+f3fff7...@syzkaller.appspotmail.com

Tested on:

commit: d7a5aa4b Merge tag 'perf-tools-fixes-for-v6.11-2024-08..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a1c35d980000

kernel config: https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b
dashboard link: https://syzkaller.appspot.com/bug?extid=f3fff775402751ebb471
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=17841a91980000

Note: testing is done by a robot and is best-effort only.